Java Web应用中获取客户端的真实IP地址

Java Web应用中获取客户端的真实IP地址，尤其在存在代理服务器的情况下。

代码示例：

public static String getClientIP(HttpServletRequest request) {
   
    String ip = parseCommaSeparatedIPs(request.getHeader("X-Forwarded-For"));
    if (isInvalid(ip)) {
   
        ip = parseCommaSeparatedIPs(request.getHeader("X-Real-IP"));
    }
    if (isInvalid(ip)) {
   
        ip = parseCommaSeparatedIPs(request.getHeader("Proxy-Client-IP"));
    }
    if (isInvalid(ip)) {
   
        ip = parseCommaSeparatedIPs(request.getHeader("WL-Proxy-Client-IP"));
    }
    if (isInvalid(ip)) {
   
        ip = request.